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如图,⊙P与x轴切于点O,点P的坐标为(0,1).点A在⊙P上,且位于第一象限,...
如图,⊙P与x轴切于点O,点P的坐标为(0,1).点A在⊙P上,且位于第一象限,∠APO=120°.⊙P沿x轴正方向滚动,当点A第一次落在x轴上时,点A的横坐标为
.(结果保留π)
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中,自变量x的取值范围是
.
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如图,在直角梯形ABCD中,AD∥BC,∠ABC=90°,BD⊥DC,BD=DC,CE平分∠BCD,交AB于点E,交BD于点H,EN∥DC交BD于点N.下列结论:
①BH=DH;②CH=
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;③
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.
其中正确的是( )
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A.①②③
B.只有②③
C.只有②
D.只有③
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已知:如图,在正方形ABCD外取一点E,连接AE、BE、DE.过点A作AE的垂线交DE于点P.若AE=AP=1,PB=
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.下列结论:①△APD≌△AEB;②点B到直线AE的距离为
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;③EB⊥ED;④S
△APD+S
△APB=1+
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;⑤S
正方形ABCD=4+
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.其中正确结论的序号是( )
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A.①③④
B.①②⑤
C.③④⑤
D.①③⑤
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如图,已知A、B两点的坐标分别为(2,0)、(0,2),⊙C的圆心坐标为(-1,0),半径为1.若D是⊙C上的一个动点,线段DA与y轴交于点E,则△ABE面积的最小值是( )
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A.2
B.1
C.
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D.
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